On my 70D, why is 250mm by Canon a larger zoom than 250mm by Sigma?

Started Jul 26, 2014 | Questions thread
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R2D2
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Re: On my 70D, why is 250mm by Canon a larger zoom than 250mm by Sigma?
In reply to Sir Atfus, Jul 26, 2014

Sir Atfus wrote:

Thanks Howard.. I think Focus Breathing is the lingo. I've never heard of this.

It's pretty common actually.

Re-shoot your test at Infinity and see how things stack up.

R2

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